Parabolic flute drills are designed for deep hole drilling (a deep
hole is any hole that is deeper than 4 times the diameter of the drill bit). HSS Parabolic-Flute Drill Bits from Lee Valley Tools. 019820 Precision Twist Right Hand Heavy-Duty Tin HSS 135deg Jobber Length
Drill Bits. I have several of the Colt 5 Star Parabolic bits and LOVE them. Drill bits are an integral feature of drilling tools. See more detail at http://parabolic.drill.bit.bestcheaphanddrills.com
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